watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:0:7]
Modules linked in:
irq event stamp: 1750409
hardirqs last  enabled at (1750408): [<ffff80008a570c30>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (1750408): [<ffff80008a570c30>] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (1750409): [<ffff80008a56e84c>] __el1_irq arch/arm64/kernel/entry-common.c:499 [inline]
hardirqs last disabled at (1750409): [<ffff80008a56e84c>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:517
softirqs last  enabled at (1745976): [<ffff800085606d0c>] pppoe_flush_dev drivers/net/ppp/pppoe.c:327 [inline]
softirqs last  enabled at (1745976): [<ffff800085606d0c>] pppoe_device_event+0x45c/0x498 drivers/net/ppp/pppoe.c:346
softirqs last disabled at (1745978): [<ffff80008894f0a8>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.5.0-rc7-syzkaller-00063-g35e2132122ba #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: events ser_release
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383
lr : queued_spin_lock_slowpath+0x168/0xcf8 kernel/locking/qspinlock.c:383
sp : ffff800092a27560
x29: ffff800092a27600 x28: 1fffe0001b7bba18 x27: 1ffff00012544eb8
x26: dfff800000000000 x25: 1fffe0001b7bba1a x24: ffff800092a27580
x23: ffff800092a275c0 x22: ffff700012544eb0 x21: 0000000000000001
x20: 0000000000000001 x19: ffff0000dbddd0c0 x18: 0000000000000000
x17: ffff8001261ea000 x16: ffff8000809af138 x15: 0000000000000001
x14: 1fffe0001b7bba18 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60001b7bba19 x10: 1fffe0001b7bba18 x9 : 0000000000000000
x8 : 0000000000000001 x7 : ffff80008894465c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008a65da7c
x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001
Call trace:
 __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline]
 __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline]
 queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x320/0x348 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0x50/0x60 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 __netif_tx_lock include/linux/netdevice.h:4373 [inline]
 netif_freeze_queues net/sched/sch_generic.c:459 [inline]
 netif_tx_lock+0x9c/0x1d8 net/sched/sch_generic.c:468
 netif_tx_lock_bh include/linux/netdevice.h:4457 [inline]
 dev_watchdog_down net/sched/sch_generic.c:563 [inline]
 dev_deactivate_many+0x274/0xa8c net/sched/sch_generic.c:1348
 __dev_close_many+0x26c/0x3c4 net/core/dev.c:1513
 dev_close_many+0x1e0/0x470 net/core/dev.c:1551
 dev_close+0x174/0x250 net/core/dev.c:1577
 ser_release+0x188/0x238 drivers/net/caif/caif_serial.c:309
 process_one_work+0x800/0x1480 kernel/workqueue.c:2600
 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2751
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853